28 vs 40 kHz Ultrasonic Cleaner: Which Frequency Should You Use?
A dual-frequency ultrasonic cleaner gives you two cavitation settings instead of one. This VEVOR 30 L model switches between 28 kHz and 40 kHz, adds a Degas mode, and combines 600 W ultrasonic power with a 500 W heater. The right setting depends on the item, contamination, cleaning solution and material sensitivity—not simply on choosing the highest number.
28 kHz or 40 kHz — which ultrasonic frequency should you use?
In general, lower ultrasonic frequencies create larger cavitation bubbles and more energetic collapse, while higher frequencies create smaller bubbles that can reach finer features. On this VEVOR cleaner, 28 kHz is the lower-frequency option and 40 kHz is the higher-frequency option. Start with the item manufacturer’s cleaning guidance, use a compatible solution, and choose the gentlest effective setting for delicate parts.
View the VEVOR 30L Dual-Frequency Cleaner →Key Specifications
| Tank Capacity | 30 L |
|---|---|
| Frequency | 28 kHz / 40 kHz, switchable |
| Ultrasonic Power | 600 W |
| Heating Power | 500 W |
| Temperature Range | 0–80°C |
| Timer | 0–30 minutes |
| Tank Material | SUS304 stainless steel |
28 kHz vs 40 kHz Ultrasonic Cleaning
28 kHz
Lower-frequency ultrasonic cleaning generally produces larger cavitation bubbles and stronger collapse energy. It can be useful when more aggressive cleaning action is appropriate for a robust part, but material compatibility still matters.
40 kHz
Higher-frequency cleaning generally produces smaller cavitation bubbles that can work around finer details and narrower features. It is often the better starting point when the item is more delicate or has intricate geometry.
Sweep, Turbo and Degas Modes
The supplier lists three working modes on this model:
- Sweep: listed at 28 kHz.
- Turbo: listed at 40 kHz.
- Degas: intended to help remove trapped gas from fresh cleaning solution before or during cleaning.
How Heating and Time Affect the Process
This cleaner lets you set liquid heating from 0–80°C and cleaning time from 0–30 minutes. Heat can improve cleaning performance for some compatible solutions and soils, but hotter is not automatically better.
Always follow the cleaning-solution manufacturer’s temperature limits and the item manufacturer’s material guidance. Some plastics, coatings, adhesives, gemstones, electronics, plated surfaces and delicate assemblies may be damaged by inappropriate heat, chemistry or ultrasonic exposure.
How to Choose a Frequency and Setting
01 · Identify the material
Confirm that the item can safely be exposed to ultrasonic cleaning and the intended cleaning solution.
02 · Start with the gentler effective approach
For delicate or intricate items, a higher-frequency setting may be the more conservative starting point. Robust parts may tolerate lower-frequency cleaning when appropriate.
03 · Degas fresh solution
Use the Degas function when appropriate to reduce dissolved or trapped gas that can interfere with consistent cavitation.
04 · Set heat conservatively
Stay within the item and solution temperature limits; do not assume the cleaner’s 80°C maximum is appropriate for every job.
05 · Inspect after short cycles
For unfamiliar parts, shorter initial cycles make it easier to check progress and avoid unnecessary exposure.
Important Safety and Use Limits
- Do not use flammable or otherwise unsuitable liquids in the tank unless the equipment and process are specifically designed for them.
- Do not reach into the tank while ultrasonic cleaning is operating.
- Use the basket or appropriate support rather than placing items directly against sensitive tank surfaces when the manual calls for it.
- Ultrasonic cleaning removes contamination; it does not by itself establish sterilization or disinfection.
- For dental, medical, laboratory or regulated applications, follow the applicable validated cleaning, disinfection and sterilization procedures separately.
Quick Setup Checklist
- The item is compatible with ultrasonic cleaning.
- The cleaning solution is compatible with the tank and item.
- I selected 28 or 40 kHz based on the part and cleaning goal.
- I set a suitable temperature below the material and solution limits.
- I chose an appropriate cycle time and will inspect progress.
- I understand cleaning is separate from sterilization or disinfection requirements.
VEVOR 30L Dual-Frequency Ultrasonic Cleaner
30 L tank, switchable 28/40 kHz, 600 W ultrasonic power, 500 W heating, 0–80°C temperature setting and 0–30 minute timer.
View the 30L Cleaner →Frequently Asked Questions
Cleaning results and material compatibility vary by item, contamination and solution. Follow the item, solution and ultrasonic-cleaner instructions.